Compilare: user.cpp: In function ‘int read_int()’: user.cpp:16:53: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (pos >= DIM) fread(buf, 1, DIM, stdin), pos = 0; ^ user.cpp:22:53: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (pos == DIM) fread(buf, 1, DIM, stdin), pos = 0; ^ user.cpp: In function ‘int main()’: user.cpp:48:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in", "r", stdin); ^ user.cpp:49:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.out", "w", stdout); ^ user.cpp: In function ‘void update()’: user.cpp:31:93: warning: iteration 390u invokes undefined behavior [-Waggressive-loop-optimizations] for (int i = first(pos), j = 0; j < DIM; ++i, ++j) MaxBuc[i] = MAX(val[i], MaxBuc[pos_buc]); ^ user.cpp:31:2: note: containing loop for (int i = first(pos), j = 0; j < DIM; ++i, ++j) MaxBuc[i] = MAX(val[i], MaxBuc[pos_buc]); ^